/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package a.gui.proguard.gui;

import proguard.*;

import javax.swing.*;
import java.awt.*;
import java.io.*;

/**
 * This <code>Runnable</code> runs ProGuard, sending console output to a text area and any exceptions to message
 * dialogs.
 *
 * @see ProGuard
 * @author Eric Lafortune
 */
final class ProGuardRunnable implements Runnable {
    private final JTextArea consoleTextArea;
    private final Configuration configuration;
    private final String configurationFileName;

    /**
     * Creates a new ProGuardRunnable object.
     * 
     * @param consoleTextArea the text area to send the console output to.
     * @param configuration the ProGuard configuration.
     * @param configurationFileName the optional file name of the configuration, for informational purposes.
     */
    public ProGuardRunnable(JTextArea consoleTextArea, Configuration configuration, String configurationFileName) {
        this.consoleTextArea = consoleTextArea;
        this.configuration = configuration;
        this.configurationFileName = configurationFileName;
    }

    // Implementation for Runnable.

    public void run() {
        consoleTextArea.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
        consoleTextArea.setText("");

        // Redirect the System's out and err streams to the console text area.
        PrintStream oldOut = System.out;
        PrintStream oldErr = System.err;

        PrintWriter outWriter = new PrintWriter(new TextAreaWriter(consoleTextArea), true);
        PrintStream outStream = new PrintStream(new TextAreaOutputStream(consoleTextArea), true);

        System.setOut(outStream);
        System.setErr(outStream);

        try {
            // Create a new ProGuard object with the GUI's configuration.
            ProGuard proGuard = new ProGuard(configuration);

            // Run it.
            proGuard.execute();

            // Print out the completion message.
            outWriter.println("Processing completed successfully");
        } catch (Exception ex) {
            // ex.printStackTrace();

            // Print out the exception message.
            outWriter.println(ex.getMessage());

            // Show a dialog as well.
            MessageDialogRunnable.showMessageDialog(consoleTextArea, ex.getMessage(), msg("errorProcessing"),
                JOptionPane.ERROR_MESSAGE);
        } catch (OutOfMemoryError er) {
            // Forget about the ProGuard object as quickly as possible.
            System.gc();

            // Print out a message suggesting what to do next.
            outWriter.println(msg("outOfMemoryInfo", configurationFileName));

            // Show a dialog as well.
            MessageDialogRunnable.showMessageDialog(consoleTextArea, msg("outOfMemory"), msg("errorProcessing"),
                JOptionPane.ERROR_MESSAGE);
        } finally {
            // Make sure all output has been sent to the console text area.
            outWriter.close();

            // Restore the old System's out and err streams.
            System.setOut(oldOut);
            System.setErr(oldErr);
        }

        consoleTextArea.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));

        // Reset the global static redirection lock.
        ProGuardGUI.systemOutRedirected = false;
    }

    // Small utility methods.

    /**
     * Returns the message from the GUI resources that corresponds to the given key.
     */
    private String msg(String messageKey) {
        return GUIResources.getMessage(messageKey);
    }

    /**
     * Returns the message from the GUI resources that corresponds to the given key and argument.
     */
    private String msg(String messageKey, Object messageArgument) {
        return GUIResources.getMessage(messageKey, new Object[] {messageArgument});
    }
}
